This comprehensive service repair manual provides detailed instructions and illustrations for servicing and repairing the Exhaust Aftertreatment System with Selective Catalytic Reduction (SCR) on 2015 Navistar 9900 trucks. It covers a wide range of models including DuraStar, LoneStar, PayStar, ProStar+, TerraStar, TranStar, and WorkStar. The manual delves into the intricacies of the system, offering detailed explanations of its components and functions. From general service information to specific repair procedures, the manual provides step-by-step guidance for various configurations including Switchback/Horizontal, Vertical/Vertical, and Inline setups. It also includes specific details on the Diesel Exhaust Fluid (DEF) system and a comprehensive acronym list for easy reference. The manual is designed to be user-friendly, providing clear instructions and numerous illustrations to facilitate understanding and ensure successful repairs. It is an invaluable resource for both experienced mechanics and do-it-yourself enthusiasts, offering a cost-effective way to maintain the proper functioning of your vehicle.

The 2015 Navistar 9900 Exhaust Aftertreatment System with SCR Service Repair Workshop Manual is an essential resource for technicians and mechanics working on various Navistar truck models. This comprehensive manual provides detailed information and step-by-step instructions for servicing and repairing the Selective Catalytic Reduction (SCR) system, a crucial component of the truck's emissions control technology. The manual covers a wide range of topics, including system diagnostics, component identification, troubleshooting procedures, and repair techniques. It features clear illustrations, diagrams, and specifications, ensuring accurate understanding and efficient repair execution. This manual is applicable to several Navistar truck models, including the 9900, DuraStar, LoneStar, PayStar, ProStar+, TerraStar, TranStar, and WorkStar.

The SCR system plays a vital role in reducing harmful pollutants, particularly nitrogen oxides (NOx), from the truck's exhaust gases. It uses a process that involves injecting a urea-based fluid, called Diesel Exhaust Fluid (DEF), into the exhaust stream, where it reacts with NOx molecules to convert them into harmless nitrogen gas and water vapor. The manual provides a deep understanding of the SCR system's operation, including the functions of the SCR catalyst, the DEF injection system, and the system's control module. It also covers common issues that can arise, such as DEF system malfunctions, catalyst degradation, and sensor failures. By providing in-depth knowledge and practical guidance, the 2015 Navistar 9900 Exhaust Aftertreatment System with SCR Service Repair Workshop Manual empowers technicians to effectively diagnose, service, and repair the SCR system, ensuring optimal performance and compliance with environmental regulations.